[RenoKeene]

Welcome aboard from Central Florida!
I think you will find coils are easier to deal with and ride better than leafsprings, depends on what your end goal is (work-fun). There are more wheel choices in 5 lug than 6 lug.
As far as shopping for a project goes you might want to sit down and put some stuff on paper like this:
Chevy or GMC
Long bed or Shortbed
Fleetside or Stepside
1/2 ton or 3/4 ton
6 cyl or V8
Do you have fab skills, welding, body and paint, mechanical, electrical
How much $$ in your budget
Whatever else you do you will want to start with as rust-free metal as you can find/afford, and look at lots and lots of trucks before you buy one. You will be better off in the long run.

You came to the right place for info, super smart folks in here willing to help when they can. I also suggest you spend the $25 to support the board so you can buy and sell parts on here, it will be the best money you spend on your project, no doubt about it.
Good luck.